you're just going to click right away with him
You will know if they are the right horse. You will just click. If you two do not match, don't be afraid to tell your trainer, you do not want to be stuck with a horse that doesn't feel right. Also, don't feel any pressure to buy them just if they are cute or your friend's old horse they want you to buy/lease.
If you can't get enough when you ride! You finish your lesson but you still want to ride then you know it's the right match
This may not help but you just kind of know